Low Temperature Drying of Japanese Cedar by a Principle of the Same Direction Transfer of Heat and Moisture and Its Effect on the Reduction of Environmental Burden

考虑雪松木材的结构各向异性和热湿同向传递原理，对木材低温干燥特性进行了研究。在恒温梯度下单向干燥实验中，观察到木材的干燥速率和干燥收缩率随水分传递方向和木材纹理的变化有较大的变化。在热量和水分传递方向相同的情况下，水分含量和干燥收缩率的局部差异很小，这一结果可以通过包括水的蒸发和冷凝的水分扩散模型成功地再现。结果表明，木材中油脂含量随干燥温度的变化而变化。

The characteristics of low temperature wood drying has been investigated taking into account the structural anisotropy of cedar lumber and the principle of the same direction transfer of heat and moisture. Considerable changes in drying rate and drying shrinkage with the direction of moisture transfer and the texture of wood were observed in the experiment of one-directional drying under a constant temperature gradient. In the case of the same direction transfer of heat and moisture, small local difference was found in moisture content and drying shrinkage, of which results were successfully reproduced by a moisture diffusion model including vaporization and condensation of water. Finally, it was shown that the content of oil in wood was changed with the drying temperature.